Basing this on states with active secessionist movements, I've opted for the preferential system of balloting so everyone has fifteen votes each:

5 for the state they identify as most likely to secede4 for second most3 third most2 ...1 duh

Alternatively,

5/5 for 1st place tie3 for your second choice2 for your third choice1 for last place choice

or

4/4/4 for a three way tie21

or 3 votes for each state if you think they're all just as likely to secede

OK I ave reached the bottom of the bar so the typebar's on the fritz. You must use all fifteen of your votes or this doesn't really work. If you don't understand or like this hip new way of voting, don't worry, more than half the British electorate felt the same last year.